<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <style>
        canvas{
            <!-- background-color: #000; -->
        }
    </style>
</head>
<body>
    <canvas id="canvas" height="800" width="800"></canvas>
    <script>
        var canvas = document.getElementById("canvas");
        var ctx = canvas.getContext("2d")

ctx.beginPath()
ctx.arc(130,130,100,0,Math.PI/2)
ctx.stroke() 
    </script>
</body>
</html>